<!-- 定义导航栏 -->
<nav class="navbar navbar-expand-lg navbar-dark bg-primary">
    <div class="container">

        <!-- 导航栏标识 -->
        <a class="navbar-brand" href="/">首页</a>

        <!-- 导航入口 -->
        <div>
        <ul class="navbar-nav">
            <!-- 条目 -->
            <li class="nav-item">
            <a class="nav-link" href="/blog">博客文章</a>
            </li>
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    </div>
</nav>